rtapi_region − functions to manage I/O memory regions
void *rtapi_request_region(unsigned long base, unsigned long int size, const char *name)
void rtapi_release_region(unsigned long base, unsigned long int size)
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base |
The base address of the I/O region |
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size |
The size of the I/O region |
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name |
The name to be shown in /proc/ioports |
rtapi_request_region reserves I/O memory starting at base and going for size bytes.
May be called from realtime init/cleanup code only.
On kernels before 2.4.0, rtapi_request_region always suceeds.
rtapi_request_region returns NULL if the allocation fails, and a non-NULL value otherwise.
rtapi_release_region has no return value.